O Prophet! We have permitted to you your wives to whom you have given their dowries, and those you already have, as granted to you by God, and the daughters of your paternal uncle, and the daughters of your paternal aunts, and the daughters of your maternal uncle, and the daughters of your maternal aunts who emigrated with you, and a believing woman who has offered herself to the Prophet, if the Prophet desires to marry her, exclusively for you, and not for the believers. We know what We have ordained for them regarding their wives and those their right-hands possess. This is to spare you any difficulty. God is Forgiving and Merciful.

The Holy Quran · Al-Ahzaab (The Clans) · 33:50